We are on the wayCalls are working for me. Just did brief testing with my office phone if I can hear TV in the other room and I could. Usually I don't use calls via Watch But it seems to work
That it works is the expectation. But, the detailed issue is now, that the BT connecting between the phone and the watch is not established automatically, if it was lost or after phone boots.
Please try to connect (as you see in your screenshot), then reboot the phone and check if it will connect again, without pressing manually at "Amazfit GTR 2...".